Heil fan guard

HEIL HVAC MODEL # H BBC- F04268, SER # WHKM041227. PLEASE ADVISE WHERE A HOME OWNER CAN FIND A NEW FAN GUARD FOR THE OUT SIDE UNIT. HEIL AIR CONDITION UNIT FAN GUARD IS 27" x 27" WITH THE FAN MOTOR BOLT PATTERN 5 1/4 X 5 1/4.
HOME WAS BUILT IN 2001 AND THE FAN GUARD HAS GOTTEN RUSTED!